alphabet/detail/convert.hpp

// SPDX-FileCopyrightText: 2006-2025 Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2025 Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: BSD-3-Clause

 
#pragma once
 
#include <array>
 
#include <seqan3/alphabet/detail/concept.hpp>
 
// ============================================================================
// conversion to/from char/rank types
// ============================================================================
 
namespace seqan3::detail
{

template <typename in_t, typename out_t>
    requires convertable_to_through_char_representation<in_t, out_t>
constexpr std::array<out_t, alphabet_size<in_t>> convert_through_char_representation{
    []() constexpr
    {
        std::array<out_t, alphabet_size<in_t>> ret{};
 
        // for (decltype(alphabet_size<in_t>) i = 0; ...) causes indefinite compilation :(
        for (auto i = decltype(alphabet_size<in_t>){0}; i < alphabet_size<in_t>; ++i)
            assign_char_to(to_char(assign_rank_to(i, in_t{})), ret[i]);
 
        return ret;
    }()};
 
} // namespace seqan3::detail